(19)
(11) EP 1 516 586 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.04.2005 Bulletin 2005/16

(43) Date of publication A2:
23.03.2005 Bulletin 2005/12

(21) Application number: 04022243.2

(22) Date of filing: 17.09.2004
(51) International Patent Classification (IPC)7: A61B 5/18, A61B 5/0488
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 17.09.2003 JP 2003325043

(71) Applicant: THE YOKOHAMA RUBBER CO., LTD.
Tokyo (JP)

(72) Inventors:
  • Kuramori, Akira,c/oThe Yokohama Rubber Co., Ltd.
    Hiratsuka-City Kanagawa Prefecture (JP)
  • Koguchi, Noritaka,c/oThe Yokohama Rubber Co., Ltd.
    Hiratsuka-City Kanagawa Prefecture (JP)
  • Kamijo, Masayoshi,c/oShinshu University
    Ueda-shi Nagano prefecture (JP)
  • Sadoyama, Tsugutake,c/oShinshu University
    Ueda-shi Nagano prefecture (JP)

(74) Representative: VOSSIUS & PARTNER 
Siebertstrasse 4
81675 München
81675 München (DE)

   


(54) Stress-at-work evaluating device and method


(57) A stress-at-work evaluating device evaluates a stress of a subject at a work by measuring of activities of a muscle, which are independent of activities of right and left masseter for opening and closing a jaw of the subject. The device evaluates the stress by normalizing myoelectric potential of the masseter muscles by a level of an external force acting on a head of the subject at the work. Alternatively, simultaneous contraction intensity of the right and left masseter muscles obtained by a simultaneous contraction waveform of the masseter muscles can be used instead of the normalized myoelectric potential.






Search report